Malicious PDF — malware analysis report

Static analysis result for SHA-256 861f59ba9d62d2b4…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 22:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5497efb7700bdbb4cc78928f8e0c3dc SHA-1: cc642cd351d723c8d88cbd693ccd9145dd520306 SHA-256: 861f59ba9d62d2b41b2727b4ba948089d39a5cc7351af60a8ce1cca8b12166c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160825e8ea33e9---jeramano.pdf
    • https://twr1115.net/files/fckeditor/file/pobade.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a631a7ec083---bekamogozikugopetiw.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lg3b3fbkute6iepcgujufqb484/45531851563.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a29914293---juvom.pdf
    • http://chikatere.com/Upload/files/lowilaso.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rjovcpnbn6r8grahhp7ju486o3/42134187480.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/petelefikatexu.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896112195ee---6836951556.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7f0b93bf---55117997493.pdf
    • http://matkinhantai.com/luutru/files/39971131838.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f3kmnqtobe5njb0d0ntujjr1bu/77305530772.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/uua7le41vh5f772ujot39bolcv/14673199815.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/86ogo6unme12u3bo6uupugqlm5/89677330946.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/564b09a2b16fb08bd367c75d5c0c0097/12689306775.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/7814298077.pdf
    • http://cuatudongbinhduong.net/uploads/files/28704516075.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be5fcab2d---44777103089.pdf
    • http://nicenpos.com/userData/board/file/ponibez.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cpe0sl0gj7k9jg48v1pc9t7tv1/95644853908.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6222f8e82c---terokepivovirubovetazunor.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/p8270aoiq97k52m236lt76t7a6/25409644903.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18082342---99687255947.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/sc46lgc8j0uf7eu28tikbccai7/91128341234.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=1500+usd+to+thb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 16792 bytes
font_01_sfnt_off000115a0.bin
de94e591cf4c37f48014dc2ea2a75575dd657344a34f6d0671c47ec2fa368363
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 16680 bytes
font_02_sfnt_off00014161.bin
6c5a92a3f89f562d39257e6993c8b8e1f865b9af38e1167e73ebad85712da68a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14161 10160 bytes